Over 300 color illustrations! Especially with red deer a balanced age structure is enormously important. This can be ensured in the long term only by a responsible age approach. Some well-known "rules" for recognizing old or young deer are well-tried and usually lead to the goal for the experienced professional, but others are not as safe as one might think. The author has documented his experiences with great photo series of different deer, which he has taken over years. In this way, he vividly illustrates the aging of mountain deer and explains his method of age estimation, the cornerstones of which are close observation and conscious perception of various distinguishing features.